Losing Miles Sitting in the Garage After Full Charge

[BooKitty]

Cool - thanks for the update.

I have a Digital Clamp Multimeter so I can check the current draw - just need to find a spot to clamp it.
Also have a KW meter in line with the Clipper Creek charger, so I can see the total accumulated KW consumption after the car is charged.

Ultimately I don't think its much, and I was just looking for the "official" specs on that from Chevy. Mostly Im surprised at how little the EV Specialists know about their car and that the customer (myself) has to practically reverse engineer the car to get a simple answer to a basic question.

Variable conditions aside, an answer like "the most power the TMS will will use is X as per the designed operational specs for maximum cooling/heating of the battery pack at the widest range of temperature extremes"... the "X" has to be a known factor by someone at Chevy - thats all Im asking.

Sometimes it seems like its Orson Wells where machines make machines & the humans have no idea how anything works...
maybe thats closer than we think

Anyway, done barking up that tree - I will just have to take the time to find out myself.

 

[NORTON]

...an answer like "the most power the TMS will will use is X as per the designed operational specs for maximum cooling/heating of the battery pack at the widest range of temperature extremes"... the "X" has to be a known factor by someone at Chevy - thats all Im asking.
.... I will just have to take the time to find out myself.

But you see their lack of 'X' is,, there is never a constant temp in Anchorage or in Tucson.
And you are asking if the car is totally charged and then sits there plugged in to use TMS to keep the battery at a happy temp.
'What is the usage of just the TMS?'
That is a good question.

You can get that answer for yourself with your kWh meter, but even then that will be a variable number depending on temp and time and sunlight and wind, etc.

I'm interested in seeing your results !

edit: I pugged in at home to assist the guy with the continuous draw after the green light is flashing. I saw no TMS draw in 90-70 deg temps overnight.
But my EVSE only has 1 kWh resolution. After 99.9 kWh it only displays whole kWh's.

 

[ats777]

Hello,

I have the exact same issue as BooKitty. We have seen temperatures suddenly increase here (DC area) and now the battery conditioning draws a significant amount of power. The situation is worse if you are in a public charging station, paying real money for charging.

At our public garage, with a Blink charger, I expected a charge for about 2 hrs, ended up paying for 8 hours because it never shut off. So, instead of a $1 bill, I paid close to $5.

I measured how much it was charging when I arrived and noticed that the energy usage went by 0.01KWh in about 30 seconds. So, extrapolating that would mean a draw of 0.01 x 120 = 1.2 KW/hr. This is pretty high, imho and weirdly it doesn't seem to cool down at all. It seems to run it pretty much the entire period.

ATS

 

[ats777]

Another update on this issue.

After a long conversation with the dealer, they basically said that there is no issue and the system is working as designed. This is a serious design flaw, imho. This is the only EV I have owned (having owned Leaf, MiEV, Tesla S, Prius Plug In, Sonata Plug In) that exhibits this behavior. None of the others have ever done anything like this. At this point, I am going to have to figure out a different way by which to stop the wall charger since the car is not cooperating.

ATS

 

[NORTON]

Does the blink service have an app or website to let you see your daily, weekly, monthly, lifetime usage the way Chargepoint does?

It has been hot here, High 90's for a while now.

Around noon I get the Onstar txt saying charge complete.
Then at the most 25 minutes later I'll get a txt from Chargepoint saying my "car is drawing little power and is probably done charging".
If I look at the Chargepoint graph for the day, I see when Onstar txt me it dropped from 3.3 kWh to ~0.70 kWh, then that drops to zero 15 - 25 minutes later depending on how hot it is that day.
And that is when Chargepoint txt me.

This is how the TMS works on my '14 Spark EV.

I'm certain TMS is not supposed to continue drawing power for hours no matter how hot or cold it is. The battery pack is insulated.
And the car is not supposed to use battery power for TMS if it is just sitting unplugged. The car is not supposed to lose SOC just sitting.

What can you do if your local dealer wants you out of there and tells you "All is well"??? I don't know... Find a better dealership? Keep contacting the EV group at Chevy Customer Service?

Good Luck !

 

[wywa]

Are some of these garages acting like 'easy bake ovens'?? Would a BEV actually be better just sitting out in the sun? As a minimum such a garage should have silver sheet metal (or solar panels) on the roof and on the sides exposed to the sun.
--

 

[EldRitch]

Is it possible you left the car ON by mistake? I sometimes do that after driving my Tesla where I don't have to turn it on/off...

Try leaving the Spark EV while it is On some time. You won't ever leave it On by accident...